Where is the thermostat located on the 03 mpv? just replaced the water pump which had locked up, but now the engine is overheating.

If your vehicle's radiator is overheating and there are no visible leaks, it is possible that the problem could be caused by a faulty thermostat or water pump. These components are responsible for regulating the flow of coolant and water through the radiator and engine, and if they are not functioning properly, it can cause the engine to overheat.
To determine if the thermostat or water pump is causing the overheating issue, you will need to perform some diagnostic tests and checks. Here are a few steps you can follow:

1. Check the thermostat: The thermostat is located in the engine and controls the flow of coolant through the radiator. If the thermostat is stuck in the closed position, it can prevent the coolant from flowing and cause the engine to overheat. You can test the thermostat by removing it from the engine and checking it for proper operation.
2. Check the water pump: The water pump is responsible for circulating the coolant and water through the radiator and engine. If the pump is not functioning properly, it can cause the engine to overheat. You can test the water pump by removing the drive belt and attempting to turn the pump by hand. If the pump is seized or not turning smoothly, it may need to be replaced.
3. Check the coolant level: Make sure that the coolant level in the radiator is at the proper level. If the coolant level is low, it can cause the engine to overheat.

If you are unable to determine the cause of the overheating issue, it is recommended to have the vehicle inspected by a mechanic who can perform a more thorough diagnostic test and identify the root cause of the problem. They will be able to recommend the appropriate repairs to fix the issue and prevent further overheating.

check thermostat and water pump

Remove the battery and battery tray.
Drain the engine coolant.
Remove the water pump drive pulley.
Remove thermostat case
Remove water pump tensioner
Remove water Outlet pipe
Remove water pump
Reverse disassembly order to install water pump.
Fill and bleed cooling system

Have a cooling system flush..your heater core may be clogged.

Section 03-01D: Diesel Engine, 7.3L V-8 1992 Bronco/Econoline/F-Series Workshop Manual
REMOVAL AND INSTALLATION Please rate highly if this helps. this is 1992, only thing I have, should be the same. Thermostat A poppet-type thermostat is used with the engine. When the thermostat is closed, coolant flows to the water pump through a bypass passage at the front of the engine. When the thermostat is open, coolant flows through the coolant outlet elbow (thermostat housing) to the radiator. CAUTION: Replacement thermostats other than the specified Motorcraft or Navistar thermostats may result in engine overheat damage. The specified thermostat does not contain an internal bypass, since the by-pass is located in the cylinder block. Therefore, whenever the thermostat is replaced, it is mandatory that only Motorcraft E5TZ-8575-C or Navistar 1807945-C1 thermostat be installed.
The thermostat is a high temperature thermostat for use with a mixture of water and permanent-type antifreeze. CAUTION: Do not attempt to repair the thermostat. It should be replaced if it is not operating properly.
Check the thermostat before installing it, following the procedure described in this section.

Thermostat Design (Acceptable vs. Unacceptable)




Removal

1. Disconnect ground cables from both batteries. NOTE: On vehicles equipped with EEC, when the battery has been disconnected and reconnected, some abnormal drive symptoms may occur while the EEC processor relearns its adaptive strategy. The vehicle may need to be driven 10 miles or more to relearn the strategy.
   

1. Drain coolant from radiator until coolant level is below thermostat. Refer to Section 03-03, Engine Cooling.

1. Loosen and remove alternator and vacuum pump drive belts.

1. Remove alternator. Position alternator out of the way.

1. Remove vacuum pump and bracket. Position pump out of the way.

1. Remove all but the lowest alternator/vacuum pump mounting casting bolt. Loosen the lowest bolt and pivot the alternator/vacuum pump casting outboard.

1. Remove the water outlet housing attaching bolts. Bend the radiator upper hose upward and remove the thermostat and gasket.

1. Inspect thermostat as outlined in this section.

Installation

1. Clean the water outlet housing gasket surfaces. Coat a new outlet housing gasket with Perfect Seal Sealing Compound B5A-19554-A (ESR-M18P2-A) or equivalent. Position the water outlet housing gasket on intake manifold opening.

1. Install thermostat in crankcase opening with the copper pellet or element toward engine and the thermostat flange positioned in the recess. If thermostat is improperly installed, it will cause a restricted flow of coolant.

1. Position the water outlet housing against the crankcase. Install and tighten the attaching bolts to specification listed at the end of this section.

1. Reposition the alternator/vacuum pump casting. Install attaching bolts.

1. Install vacuum pump with bracket and tighten to specification. Refer to Section 03-05, Accessory Drive.

1. Install alternator and drive belt.

1. Install vacuum pump drive belt.

1. Adjust alternator and vacuum pump drive belts to specification. Refer to Section 03-05, Accessory Drive.

1. Fill and bleed the cooling system. Refer to Section 03-03, Engine Cooling.

1. Connect ground cables to both batteries.

1. Operate the engine until normal operating temperature is reached, then check the coolant level. Inspect cooling system for leaks. WARNING: DO NOT STAND IN LINE WITH OR NEAR RADIATOR FAN WHEN REVVING ENGINE.
   

thermostat replaced yet?

How hot did you run it before you replaced the water pump did you replace the thermostat also. If you ran it reline, blew your hoses, etc... you can have cracked head, warped head, cracked engine block.

Keep in mind rule of thumb if you replace the water pump you have to replace the thermostat also. REMOVE the thermostat and see if it is still over heating.....Even if you did replace it the one you got could have been bad.

I have the same vehicle in yard going to start tearing down tomorrow to check for issues.

If you can give me a better description of symptoms I can assist you in narrowing down the problem a little better the more info your provide the better to make a determination as to the steps you need to take to repair.

First is there water in your oil, second is there a thin film of oil in your water??
Again when the motor is running and up to normal temperature before it overheats is the engine pushing water out of of the over flow canister? If so this is a direct indication of blown head gaskets, or warped head/heads, or cracked head/heads from excessive over heating. It could become a very costly venture. Check for cost of repair versus ordering an engine, heads , etc... from www.usedengines.com. They have a very wide range of all types makes, models, etc.... and engine components and parts available for shipping.

Wicked Angel

It could be the radiator is bad. There is a plug located on the bottom of the radiator. Unscrew the plug and let the fluid drain, you should be able to see if there is rust or gunk in the water/antifreeze. Then use a garden hose and put it in the hole used to fill the radiator and let the water run.

not a lot of help on this one,sounds like you have some blockage somewhere,faulty thermostat.

You probably never cleaned the cooling system out.

If you have not get it done by pros.

It seems something is blocking the flow. If the water pump went bad you will know. Rarely ever heard a impeller breaks off like you think. The bearings and the seal break first.

Check and see also if the heater valve is working.

As for the over heating even new thermostats fail. Reverse flush is needed or the procan measure the pressure in the radiator cooling system and edetermine if there is a engine pressure problem. Tools and experience is the key in the game of diagnosis.







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